Stands for Roll One Smoke One
"Dude, last night I got so baaaked." #ROSO
"Let's ROSO and watch a movie afterwards!"
by chron123 April 09, 2012
Random Outbreak of Sexual Organs
person 1- Hey guess what?
person 2- PENIS!!!... haha ROSO
by Froot Loop 14 February 17, 2011
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